- Critical Thinking
- Logic
Fallacy Identification
Expose broken reasoning, then attack it like a champion.
- Spot 9 fallacies in real debate arguments
- Explain exactly why the reasoning breaks
- Advanced: fix it, then attack it live
Train Your Logic. Expose Bad Arguments.
Logical Fallacies in Debate: The Nine That Matter
A logical fallacy is a reasoning error that makes an argument invalid even when its conclusion sounds right. In a debate round, naming the fallacy is not enough to win the point — you have to explain why the reasoning breaks and what follows once it does. These nine account for most broken arguments in competitive debate.
Logic and fallacy drills
The nine logical fallacies in debate
| Fallacy | What it is | What it sounds like in a round | How to attack it |
|---|---|---|---|
| Strawman | Attacks a weaker version of the argument | "My opponent wants to abolish prisons entirely" — when the motion was about shorter sentences for non-violent offences | Restate your actual claim, then ask them to answer that one |
| Ad hominem | Attacks the arguer rather than the argument | "The only people who back this have never run a business" | Grant the point about the person, show the argument stands without them |
| Slippery slope | Claims one step forces an inevitable chain | "Allow assisted dying for the terminally ill and we'll end up euthanising the disabled" | Ask which link in the chain is doing the work, then break that one |
| False dilemma | Offers two options when more exist | "Either we fund policing properly or we accept rising crime" | Name the third option they left out |
| Circular reasoning | Assumes the conclusion inside the premise | "Censorship is wrong because the state shouldn't restrict speech" | Show the premise and the conclusion are the same claim in different words |
| Hasty generalisation | Generalises from too few cases | "Two countries tried a wealth tax and capital left, so wealth taxes always fail" | Give a counter-case and ask how big their sample is |
| Appeal to authority | Treats a source as proof in itself | "The IMF supports this, so it works" | Ask what the authority's actual reasoning was, and whether it applies here |
| Correlation vs causation | Treats things happening together as one causing the other | "Countries with more police have less crime, so more police reduces crime" | Offer a plausible third cause that produces both |
| Red herring | Changes the subject to easier ground | Asked about the cost, they answer about the moral urgency | Name what they moved away from, and return to it |
Is it a fallacy, or just an argument you don't like?
The most common mistake among intermediate debaters is not missing fallacies — it is calling everything one. Shouting strawman at a fair restatement, or ad hominem at a relevant credibility point, costs you more than saying nothing. Judges notice, and a wrongly named fallacy makes every correctly named one sound less credible.
Three tests before you name one:
- Strawman requires that they restated your argument as something you did not say. Restating it in words you would not have chosen is not a strawman.
- Ad hominem requires that the attack on the person replaces the argument. If a source's funding is genuinely relevant to whether their evidence is reliable, raising it is an argument, not a fallacy.
- Slippery slope requires that the chain is asserted without a mechanism. If they explain why each step forces the next, that is an argument you have to answer, not a fallacy you can name and dismiss.
When in doubt, attack the reasoning without naming anything. The attack is what wins the point; the label is just shorthand.
How the fallacy drill works
- 1
Receive an argument — a real one, written by another debater.
- 2
Identify the fallacy — from the nine, or say there isn't one.
- 3
Explain the flaw — why the reasoning breaks, in your own words.
- 4
Rewrite the argument — fix it, so you can see what a sound version looks like.
- 5
Attack it in a live round — turn the diagnosis into a rebuttal you could actually deliver.
Steps four and five are what separate this from a quiz. Spotting a fallacy is a recognition skill; attacking one under time pressure is a debate skill.
Skills you build with every drill
Logic training is one of the most transferable skills in debate — and in life. Every drill sharpens a different edge.
- Identify logical fallacies on sight
- Articulate exactly why reasoning is flawed
- Rebuild weak arguments into strong ones
- Cross-examine fallacious claims in live rounds
- Resist manipulation in media and politics
- Improve analytical depth in written work
Competitive debaters
Spot opponent weaknesses faster. Attack flawed arguments with precision instead of guessing where to hit.
Students & academics
Build the analytical foundation every essay, presentation, and discussion demands. Think before you write.
Critical thinkers
Train your mind to resist manipulation in politics, media, and everyday conversations.
Coaches & educators
Use structured drills to teach reasoning skills with real examples across any subject area.
Get a debate coach to read your work
Every drill can be submitted to a coach from the marketplace for a flat 5 credits. You get scores against four criteria and written feedback on each one — not a grade, but the specific thing to change next time. Coaches set their own rates for live sessions; drill evaluations are the same price from everyone.
Find a debate coachFrequently asked questions
What is a logical fallacy?
A reasoning error that makes an argument invalid regardless of whether its conclusion happens to be true. The conclusion can be correct and the argument still broken, which is why naming a fallacy doesn't automatically win you the point.
What are the nine most common logical fallacies in debate?
Strawman, ad hominem, slippery slope, false dilemma, circular reasoning, hasty generalisation, appeal to authority, correlation mistaken for causation, and red herring. Between them they cover most broken reasoning you will meet in competitive rounds.
What is the difference between a strawman and a red herring?
A strawman misrepresents your argument and then attacks the misrepresentation. A red herring ignores your argument and changes the subject. Both avoid the real point, but one distorts it while the other walks away from it.
Is it enough to name a fallacy in a debate round?
No. Naming it tells the judge you recognised something; explaining why the reasoning breaks and what follows is what wins the point. Judges rarely award a ballot for a label, and a wrongly named fallacy costs credibility.
What is the difference between correlation and causation?
Correlation means two things occur together. Causation means one produces the other. The fallacy treats the first as proof of the second, ignoring that a third factor may cause both, or that the causal arrow may run the other way.
How does the Fallacy Identification Drill work?
You get a real argument written by another debater and identify which of the nine fallacies it contains, explain why the reasoning breaks, then rewrite it soundly. The advanced section asks you to turn that into an attack you could deliver in a round.
Which logical fallacies are covered in this drill?
All nine listed above. Arguments in the drill are drawn from real debater submissions, so the fallacies appear as they actually occur — buried in otherwise reasonable arguments, rather than as textbook examples.
Is this drill good for beginners?
Yes. It is one of the most approachable drills because recognition is easier than construction, and it improves your argument writing indirectly — learning what breaks an argument teaches you what to avoid in your own.
Where do the arguments come from?
From real debater submissions on the platform, used with consent. That matters: textbook fallacy examples are obvious by design, while real arguments hide their flaws inside reasoning that mostly works.
Can I learn logical fallacies without debating competitively?
Yes. Plenty of people use this drill for critical thinking, essay writing or everyday argument rather than competition. The nine fallacies apply anywhere people reason badly, and the drill needs no debate experience.
Drills by format
Practise for your format
Lincoln-DouglasValue, criterion and one-on-one clash.Public ForumTwo-on-two, lay judges and current events.PolicyPlans, advantages, disads and impact calculus.British ParliamentaryFour teams, fifteen minutes of prep and extensions.World SchoolsThree speakers, prepared and impromptu motions, reply speeches.